INCH-POUND
MIL-DTL-45913D
14 JUNE 2011
SUPERSEDING
MIL-DTL-45913C
30 APRIL 1998
DETAIL SPECIFICATION
NUTS, SELF-LOCKING, HEXAGON,
PREVAILING TORQUE
This specification is approved for use by all Departments and Agencies of the Departments of Defense.
1. SCOPE
1.1 This specification establishes mechanical and performance requirements for prevailing-torque hexagon
locknuts.
1.2 Classification Locknuts should be of the following types, grades and series (see 6.2).
1.2.1 Types
Type I Nut, self-locking, hexagon, UNC/UNF-2B (see MIL-DTL-45913/1 and /2).
Type II Nut, self-locking, hexagon, UNC/UNF-3B (see MIL-DTL-45913/3 and /4).
Type III Nut, self-locking, flanged, prevailing-torque.
1.2.2 Grades Three grades of carbon and alloy steel locknuts are designated as Grade 2, 5, and Grade 8 in
accordance with SAE J995 and two groups of corrosion resistant steels, designated as 300 series alloy, group 1 or
316 series alloy, group 2, as noted in ASTM F594. Nonferrous materials as specified herein may be used for
locknuts, but tensile strengths specified below do not apply (see 6.2).
Comments, suggestions, or questions on this document should be addressed to Defense Supply Center
Philadelphia (DSCP), ATTN: DSCP-NASA, 700 Robbins Avenue, Philadelphia, PA 19111-5096 or e-
mail to dscpg&ispecomments@dla.mil . Since contact information can change, you may want to verify
the currency of this address information using the ASSIST Online database at https://assist.daps.dla.mil
.
AMSC N/A
FSC 5310
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